Pulsafeeder Pulsa GLM DM7 - Manual (Page 28)

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11. Piping Accessories
Pressure Relief Valves
Pressure relief valves are designed to protect chemical feed systems from damage that may be
caused by defective equipment or a blockage in the discharge line. These valves function to limit
the pressure downstream of the pump. Field adjust the pressure relief valve to operate when the
discharge pressure exceeds operating pressure by 10-15%. Pressure relief valve should always
be adjusted to a setting below the maximum rated pressure of the pump. No potentially
restrictive components, such as a valve, should be installed between the pump discharge and
the PRV.
Diaphragm Backpressure Valve
A diaphragm backpressure valve creates constant back pressure. A PTFE or PTFE-faced
diaphragm offers maximum chemical protection and service life, and seals spring and
bonnet from product.
Be sure to install with fluid flow in direction of arrow on valve body.
Pulsation Dampener
A pulsation dampener is a pneumatically charged diaphragm-type chamber that intermittently
stores hydraulic energy. Used on the inlet, it can improve NPSHA (Net Positive Suction Head
available) characteristics of the suction piping system. On the discharge line it will reduce
discharge pressure and pulsating flow variations.